test: test undefined in util

PR-URL: #22741 Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Trivikram Kamat <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Michael Dawson <[email protected]> Reviewed-By: Sakthipriyan Vairamani <[email protected]>

Author: ZYSzys

test/parallel/test-util.js

@@ -113,14 +113,17 @@ assert.strictEqual(util.isBoolean(false), true);
 assert.strictEqual(util.isBoolean('string'),false);
 
 assert.strictEqual(util.isNull(null),true);
+assert.strictEqual(util.isNull(undefined),false);
 assert.strictEqual(util.isNull(),false);
 assert.strictEqual(util.isNull('string'),false);
 
+assert.strictEqual(util.isUndefined(undefined),true);
 assert.strictEqual(util.isUndefined(),true);
 assert.strictEqual(util.isUndefined(null),false);
 assert.strictEqual(util.isUndefined('string'),false);
 
 assert.strictEqual(util.isNullOrUndefined(null),true);
+assert.strictEqual(util.isNullOrUndefined(undefined),true);
 assert.strictEqual(util.isNullOrUndefined(),true);
 assert.strictEqual(util.isNullOrUndefined('string'),false);